Riivolution includes a special Patch Format element that will allow the Ocarina patch code engine to be run. While Ocarina code support isn't built in to Riivolution, using this patch in an XML will allow you to use them.

Download

A Ocarina download compatible with your current setup (GCT file goes in /codes/GAMEID.gct like it would with Gecko OS) has been put together and can be extracted straight to your SD card. However, the included XML requires two changes to work for a game; these points are marked in the XML when you open it. They require you to know the game ID and filename of the GCT file you're using.

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The Ocarina Memory Element

A special version of a memory element can be used like so: 

  <memory ocarina="true" value="7CE33B783887003438A7003838C7004C" offset="0x800018A8" />

This element contains two important attributes. The value attribute is used as a pattern to look for the point in the game's binary to hook into the game at. The offset attribute defines the position at which the hook should branch to.

Riivolution first looks for the value pattern, and then finds the next blr opcode that comes after it. This will be patched with an unconditional branch to the offset specified in offset. The Ocarina code handler can then be placed in memory at that offset and used like normal.

XML Template

Here's an example Riivolution XML that could be used as a base for running the Ocarina engine. 

<wiidisc version="1"> <options>
       <section name="Ocarina">
           <option name="Ocarina Handler">
               <choice name="VI Hook">
                   <patch id="ocarinabase_vi" />
                   <patch id="ocarinabase" />
               </choice>
               <choice name="KPAD Hook">
                   <patch id="ocarinabase_kpad" />
                   <patch id="ocarinabase" />
               </choice>
               <choice name="Joypad Hook">
                   <patch id="ocarinabase_joypad" />
                   <patch id="ocarinabase" />
               </choice>
               <choice name="GXDraw Hook">
                   <patch id="ocarinabase_gxdraw" />
                   <patch id="ocarinabase" />
               </choice>
               <choice name="GXFlush Hook">
                   <patch id="ocarinabase_gxflush" />
                   <patch id="ocarinabase" />
               </choice>
               <choice name="OSSleep Hook">
                   <patch id="ocarinabase_ossleep" />
                   <patch id="ocarinabase" />
               </choice>
               <choice name="AxNextFrame Hook">
                   <patch id="ocarinabase_axnextframe" />
                   <patch id="ocarinabase" />
               </choice>
           </option>
           <option name="ocarina_codes">
               <choice name="Enabled">
                   <patch id="ocarinacodes" />
               </choice>
           </option>
       </section>
   </options>

   <patch id="ocarinabase_vi">
       <memory ocarina="true" value="7CE33B783887003438A7003838C7004C" offset="0x800018A8" />
   </patch>
   <patch id="ocarinabase_kpad">
       <memory ocarina="true" value="9A3F005E38AE0080389FFFFC7E0903A6" offset="0x800018A8" />

       <memory ocarina="true" value="801D0060901E0060801D0064901E0064801D0068901E0068" offset="0x800018A8" />
   </patch>
   <patch id="ocarinabase_joypad">
       <memory ocarina="true" value="3AB500013A73000C2C1500043B18000C" offset="0x800018A8" />
   </patch>
   <patch id="ocarinabase_gxdraw">
       <memory ocarina="true" value="3CA0CC01380000613C80450098058000" offset="0x800018A8" />
   </patch>
   <patch id="ocarinabase_gxflush">
       <memory ocarina="true" value="90010014800305FC2C00000041820008" offset="0x800018A8" />
   </patch>
   <patch id="ocarinabase_ossleep">
       <memory ocarina="true" value="90A402E0806502E4908502E42C030000" offset="0x800018A8" />
   </patch>
   <patch id="ocarinabase_axnextframe">
       <memory ocarina="true" value="3800000E7FE3FB78B005000038800080" offset="0x800018A8" />
   </patch>
   <patch id="ocarinabase">
       <memory valuefile="codehandler.bin" offset="0x80001800" />
   </patch>
   <patch id="ocarinacodes">
       <memory offset="0x00001CDE" value="8000" />
       <memory offset="0x00001CE2" value="28B8" />
       <memory offset="0x00001F5A" value="8000" />
       <memory offset="0x00001F5E" value="28B8" />
       <memory valuefile="/codes/{$__gameid}{$__region}{$__maker}.gct" offset="0x800028B8" />
   </patch>
</wiidisc>